Insulation structure of secondary coil of high-voltage transformer for microwave oven

Abstract

The utility model relates to the technical field of enameled coils, and discloses a secondary coil insulation structure of a high-voltage transformer for a microwave oven, which comprises mica paper positioned outside the enameled coil and a polyester film for electrical insulation, the polyester film for electrical insulation comprises a polyester film for left electrical insulation and a polyester film for right electrical insulation which are positioned on two sides of the enameled coil, and each of the polyester film for left electrical insulation and the polyester film for right electrical insulation comprises a vertical section, a bottom section, an internal vertical section and a bent section; and the heights of the vertical section, the internal vertical section and the bent section are all higher than the thickness of the enameled coil. The upper ends of the vertical section, the internal vertical section and the bent section are all higher than the upper surface of the enameled coil, and the enameled coil is always in the polyester film for electrical insulation to play an insulation role. The polyester film for electrical insulation has certain hardness and is not prone to deformation, the insulation voltage resistance value is increased to 10 kV or above from 8 kV or above, and the insulation voltage resistance of the enameled coil is improved.

Description

Technical Field

[0001] This utility model relates to the field of enameled coil technology, specifically an insulation structure for the secondary coil of a high-voltage transformer used in microwave ovens. Background Technology

[0002] Previously, microwave oven enameled wires used insulating paper to fully cover the coil, which required a large amount of paper, precise cutting, and was time-consuming and labor-intensive. It also required the use of tape for bonding, which was troublesome and costly. The wrapping process was time-consuming and inefficient. In addition, the insulation withstand voltage value was low, only 8kV.

[0003] The publicly available document CN 219716635 U discloses a fully enclosed structure for a transformer's leakage magnet sheet. This structure includes insulating paper covering the outside of the leakage magnet sheet. The insulating paper comprises top insulating paper, left-side insulating paper, bottom insulating paper, right-side insulating paper, and a covering insulating paper. The top, left, bottom, and right insulating papers sequentially cover the top, left, bottom, and right sides of the internal leakage magnet sheet. The covering insulating paper extends from the right-side insulating paper and covers the top insulating paper. The edge of the covering insulating paper is fixed to the left-side insulating paper with insulating tape. The ends of the covering insulating paper that are not covered by the leakage magnet sheet extend beyond the ends of the leakage magnet sheet by 5-6 mm. This structure, by fully enclosing all sides of the transformer with insulating paper, wastes a significant amount of insulating paper, increases costs, and is time-consuming and labor-intensive.

[0004] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned problems, this utility model discloses an insulation structure for the secondary coil of a high-voltage transformer used in microwave ovens, which achieves insulation while reducing costs and improving work efficiency.

[0006] The technical solution of this utility model is as follows: the insulation structure of the secondary coil of a high-voltage transformer for microwave ovens includes mica paper and an electrical insulation polyester film located outside the enameled coil. The mica paper covers the enameled coil. The electrical insulation polyester film includes a left electrical insulation polyester film and a right electrical insulation polyester film located on both sides of the enameled coil. The thickness of the electrical insulation polyester film is 0.1-0.5mm. Both the left and right electrical insulation polyester films include a vertical section, a bottom section, an inner vertical section, and a bent section. The height of the vertical section, the inner vertical section, and the bent section are all higher than the thickness of the enameled coil. A locking slot is provided in the middle of the bent section. The locking slots cooperate with each other to fix the enameled coil.

[0007] Preferably, the vertical segment is located on the outer surface of the enameled coil, and the length of the vertical segment is adapted to the length of the enameled coil.

[0008] By adopting the above technical solution, the vertical section of the polyester film for electrical insulation is attached to the outside of the enameled coil, which provides insulation to the side of the enameled coil. The length of the vertical section is matched with the length of the enameled coil, which provides insulation during transportation and use.

[0009] Preferably, the bending segment bends inward along its height direction and through a crease, and the bending segment is located in the width direction inside the enameled coil. The sum of the widths of the two bending segments on the same side of the left and right electrical insulation polyester films is greater than the width of the inside of the enameled coil.

[0010] By adopting the above technical solution, the bent section provides insulation in the width direction inside the enameled coil. The overlapping part between the bent sections on both sides in the width direction is used for the snap-fit. After the snap-fit ​​is completed, it can ensure the fixation of the whole.

[0011] Preferably, the snaps of the bent sections of the left and right electrical insulation polyester films are arranged opposite each other, and the snaps are at the same height on the bent sections. The opening direction of the snaps is parallel to the upper and lower end faces of the bent sections. The upper and lower parts of the snaps are in contact with each other, and the depth of the snaps does not exceed the crease position between the bent section and the inner vertical section.

[0012] By adopting the above technical solution, the relatively set bayonets can be snapped together, and then the entire electrical insulation polyester film can be kept in a snapped state on the entire enameled coil. The bayonet is made by cutting a scissors or knife on the bent section.

[0013] Preferably, the bottom segment is located at the bottom of the enameled coil, the width of the bottom segment is adapted to the width of the enameled coil, and the two sides of the bottom segment are connected in the length direction by creases, vertical segments and internal vertical segments.

[0014] By adopting the above technical solution, the bottom section is used to support the entire enameled coil and connects the vertical sections on both sides and the internal vertical section, which facilitates the insulation of the entire enameled coil.

[0015] Preferably, the upper surfaces of the vertical section, the bent section, and the inner vertical section all extend 2-4 cm beyond the upper surface of the enameled coil. The vertical section and the inner vertical section are both perpendicular to the bottom section, and the bent section is perpendicular to the inner vertical section. The polyester film for electrical insulation always remains upright.

[0016] By adopting the above technical solution, if the electrical insulation polyester film is accidentally moved towards the bottom section during use, the part above the enameled coil can still maintain its insulation function and prevent the enameled coil from being exposed to the outside and conducting electricity.

[0017] Preferably, the mica paper completely covers the outer surface of the enameled coil and is held in place by tape, with the mica paper positioned between the enameled coil and the electrical insulation polyester film.

[0018] The advantages of this utility model are as follows: 1. This utility model can achieve insulation of the inside of the enameled coil through the internal vertical section and the bending section. The external vertical section is connected to the internal vertical section through the bottom section, which can not only achieve insulation of the outside of the enameled coil, but also play a supporting role, so that the vertical section, the external vertical section and the bottom section are stuck on the enameled coil.

[0019] 2. The upper ends of the vertical section, the inner vertical section, and the bent section of this utility model are all higher than the upper surface of the enameled coil. In this way, if the enameled coil is displaced within the electrical insulation polyester film, the electrical insulation polyester film can be kept at a sufficient distance to ensure that the enameled coil is always within the electrical insulation polyester film, thus playing an insulating role. The insulation withstand voltage value is increased to more than 10kV, thereby increasing the insulation withstand voltage of the enameled coil.

[0020] 3. The polyester film for electrical insulation of this utility model has a certain degree of hardness, which allows the polyester film for electrical insulation to always remain in a folded state and not easily deformed. Moreover, the polyester film for electrical insulation only needs to cover six sides of the enameled coil along its length, without needing to cover the whole coil, which effectively saves materials and improves work efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the polyester film for electrical insulation on the left and the polyester film for electrical insulation on the right after bending.

[0023] Figure 3 This is a schematic diagram of the unfolded structure of the polyester film for electrical insulation of this utility model with creases;

[0024] Figure 4 This is a schematic diagram of the structure of the enameled coil with mica paper of this utility model.

[0025] Among them: 1. Enamelled coil, 2. Mica paper, 3. Polyester film for electrical insulation on the left side, 4. Polyester film for electrical insulation on the right side, 5. Vertical section, 6. Bending section, 601. Bayonet, 7. Bottom section, 8. Internal vertical section, 9. Crease. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] like Figure 1-4 As shown, the insulation structure of the secondary coil of the high-voltage transformer for microwave ovens includes mica paper 2 and an electrical insulating polyester film located outside the enameled coil 1. The thickness of the electrical insulating polyester film is 0.1-0.5mm. The mica paper 2 covers the enameled coil 1. The electrical insulating polyester film includes a left electrical insulating polyester film 3 and a right electrical insulating polyester film 4 located on both sides of the enameled coil 1. Both the left electrical insulating polyester film 3 and the right electrical insulating polyester film 4 include a vertical section 5, a bottom section 7, an inner vertical section 8, and a bent section 6. The height of the vertical section 5, the inner vertical section 8, and the bent section 6 are all higher than the thickness of the enameled coil 1. A latch 601 is provided in the middle of the bent section 6. The latches 601 cooperate with each other to fix the enameled coil 1.

[0028] The vertical segment 5 is located on the outer surface of the enameled coil 1. The length of the vertical segment 5 is matched with the length of the enameled coil 1. The vertical segment 5 of the electrical insulation polyester film is attached to the outer side of the enameled coil 1, which provides insulation to the side of the enameled coil 1. The length of the vertical segment 5 is matched with the length of the enameled coil 1, which provides insulation during transportation and use.

[0029] The bending segment 6 bends inward along its height direction and through the crease 9. The width of the bending segment 6 is the distance between the crease 9 between the bending segment 6 and the inner vertical segment 8 and the end of the bottom segment 7. The bending segment 6 is located in the width direction inside the enameled coil 1. The sum of the widths of the two bending segments 6 on the same side of the left electrical insulation polyester film 3 and the right electrical insulation polyester film 4 is greater than the width inside the enameled coil 1. The bending segment 6 provides insulation in the width direction inside the enameled coil 1. The overlapping part between the two bending segments 6 in the width direction is used for the snap-fit ​​of the bayonet 601. After the snap-fit ​​of the bayonet 601 is completed, it can ensure the fixation of the whole.

[0030] The snaps 601 of the bent sections 6 of the left-side electrical insulation polyester film 3 and the right-side electrical insulation polyester film 4 are arranged opposite each other, and the snaps 601 are at the same height on the bent section 6. The opening direction of the snaps 601 is parallel to the upper and lower end faces of the bent section 6. The upper and lower parts of the snaps 601 are in contact with each other. The depth of the snaps 601 does not exceed the crease 9 between the bent section 6 and the inner vertical section 8. The snaps 601 arranged opposite each other can be snapped together, and then the entire electrical insulation polyester film can be held in place on the entire enameled coil 1. The snaps 601 are made by cutting a scissors or a knife on the bent section.

[0031] The bottom section 7 is located at the bottom of the enameled coil 1. The width of the bottom section 7 is adapted to the width of the enameled coil 1. The two sides of the bottom section 7 are connected by folds 9, vertical sections 5 and internal vertical sections 8 in the length direction. The bottom section 7 is used to support the entire enameled coil 1 and connects the vertical sections 5 on both sides and the internal vertical sections 8, which facilitates the insulation of the entire enameled coil 1.

[0032] The upper surfaces of vertical section 5, bent section 6, and inner vertical section 8 all extend 2-4 cm beyond the upper surface of enameled coil 1. Vertical section 5 and inner vertical section 8 are both perpendicular to bottom section 7. Bent section 5 is perpendicular to inner vertical section 8. The length of vertical section 5 is the sum of the lengths of the two bent sections 5 and inner vertical section 8. The electrical insulation polyester film is always kept vertical. During use, if the electrical insulation polyester film is accidentally moved towards bottom section 7, the part above enameled coil 1 can still maintain its insulation function and prevent part of enameled coil 1 from being exposed to the outside and conducting electricity.

[0033] The mica paper 2 completely covers the outer surface of the enameled coil 1 and is held in place by tape. The mica paper 2 is located between the enameled coil 1 and the electrical insulation polyester film.

[0034] Working principle: Vertical section 5 and inner vertical section 8 are perpendicular to bottom section 7, and bending section 6 is perpendicular to inner vertical section 8. Then, use scissors or a knife to make a notch 601 on bending section 6, and then attach electrical insulation polyester film to both sides of enameled coil 1. The notches on both sides are snapped together to achieve the function of surrounding and insulating enameled coil.

[0035] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An insulation structure for the secondary coil of a high-voltage transformer for microwave ovens, comprising mica paper and an electrical insulating polyester film located outside the enameled coil, wherein the mica paper covers the periphery of the enameled coil, and the electrical insulating polyester film comprises a left-side electrical insulating polyester film and a right-side electrical insulating polyester film located on both sides of the enameled coil, characterized in that: The thickness of the electrical insulation polyester film is 0.1-0.5mm. Both the left and right electrical insulation polyester films include a vertical section, a bottom section, an inner vertical section, and a bent section. The height of the vertical section, the inner vertical section, and the bent section is higher than the thickness of the enameled coil. A notch is provided in the middle of the bent section, and the notches cooperate with each other to fix the enameled coil.

2. The insulation structure of the secondary coil of the high-voltage transformer for microwave ovens according to claim 1, characterized in that: The vertical segment is located on the outer surface of the enameled coil, and the length of the vertical segment is adapted to the length of the enameled coil.

3. The insulation structure of the secondary coil of the high-voltage transformer for microwave ovens according to claim 1, characterized in that: The bending section bends inward along its height direction and through creases. The bending section is located in the width direction inside the enameled coil. The sum of the widths of the two bending sections on the same side of the left and right electrical insulating polyester films is greater than the width of the inside of the enameled coil.

4. The insulation structure of the secondary coil of the high-voltage transformer for microwave ovens according to claim 1, characterized in that: The snaps of the bent sections of the left and right electrical insulation polyester films are arranged opposite each other, and the snaps are at the same height on the bent sections. The opening direction of the snaps is parallel to the upper and lower end faces of the bent sections. The upper and lower parts of the snaps are in contact with each other, and the depth of the snaps does not exceed the crease between the bent section and the inner vertical section.

5. The insulation structure of the secondary coil of the high-voltage transformer for a microwave oven according to claim 1, characterized in that: The bottom segment is located at the bottom of the enameled coil. The width of the bottom segment matches the width of the enameled coil. The two sides of the bottom segment are connected in the length direction by creases, vertical segments, and internal vertical segments.

6. The insulation structure of the secondary coil of the high-voltage transformer for microwave ovens according to claim 1, characterized in that: The upper surfaces of the vertical section, the bent section, and the inner vertical section all extend 2-4 cm beyond the upper surface of the enameled coil. The vertical section and the inner vertical section are both perpendicular to the bottom section. The bent section is perpendicular to the inner vertical section. The electrical insulation polyester film is always kept upright.

7. The insulation structure of the secondary coil of the high-voltage transformer for microwave ovens according to claim 1, characterized in that: The mica paper completely covers the outer surface of the enameled coil and is held in place by adhesive tape. The mica paper is located between the enameled coil and the electrical insulation polyester film.

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